source3/libsmb/clientgen.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    SMB client generic functions
   4    Copyright (C) Andrew Tridgell 1994-1998
   5    Copyright (C) Jeremy Allison 2007.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "libsmb/libsmb.h"
  23 #include "../lib/util/tevent_ntstatus.h"
  24 #include "smb_signing.h"
  25 #include "async_smb.h"
  26
  27 /*******************************************************************
  28  Setup the word count and byte count for a client smb message.
  29 ********************************************************************/
  30
  31 int cli_set_message(char *buf,int num_words,int num_bytes,bool zero)
  32 {
  33         if (zero && (num_words || num_bytes)) {
  34                 memset(buf + smb_size,'\0',num_words*2 + num_bytes);
  35         }
  36         SCVAL(buf,smb_wct,num_words);
  37         SSVAL(buf,smb_vwv + num_words*SIZEOFWORD,num_bytes);
  38         smb_setlen(buf,smb_size + num_words*2 + num_bytes - 4);
  39         return (smb_size + num_words*2 + num_bytes);
  40 }
  41
  42 /****************************************************************************
  43  Change the timeout (in milliseconds).
  44 ****************************************************************************/
  45
  46 unsigned int cli_set_timeout(struct cli_state *cli, unsigned int timeout)
  47 {
  48         unsigned int old_timeout = cli->timeout;
  49         cli->timeout = timeout;
  50         return old_timeout;
  51 }
  52
  53 /****************************************************************************
  54  convenience routine to find if we negotiated ucs2
  55 ****************************************************************************/
  56
  57 bool cli_ucs2(struct cli_state *cli)
  58 {
  59         return ((cli_state_capabilities(cli) & CAP_UNICODE) != 0);
  60 }
  61
  62 /****************************************************************************
  63  Setup basics in a outgoing packet.
  64 ****************************************************************************/
  65
  66 void cli_setup_packet_buf(struct cli_state *cli, char *buf)
  67 {
  68         uint16 flags2;
  69         cli->rap_error = 0;
  70         SIVAL(buf,smb_rcls,0);
  71         SSVAL(buf,smb_pid,cli->smb1.pid);
  72         memset(buf+smb_pidhigh, 0, 12);
  73         SSVAL(buf,smb_uid, cli_state_get_uid(cli));
  74         SSVAL(buf,smb_mid,cli->smb1.mid);
  75
  76         if (cli_state_protocol(cli) <= PROTOCOL_CORE) {
  77                 return;
  78         }
  79
  80         if (cli->case_sensitive) {
  81                 SCVAL(buf,smb_flg,0x0);
  82         } else {
  83                 /* Default setting, case insensitive. */
  84                 SCVAL(buf,smb_flg,0x8);
  85         }
  86         flags2 = FLAGS2_LONG_PATH_COMPONENTS;
  87         if (cli_state_capabilities(cli) & CAP_UNICODE)
  88                 flags2 |= FLAGS2_UNICODE_STRINGS;
  89         if ((cli_state_capabilities(cli) & CAP_DFS) && cli->dfsroot)
  90                 flags2 |= FLAGS2_DFS_PATHNAMES;
  91         if (cli_state_capabilities(cli) & CAP_STATUS32)
  92                 flags2 |= FLAGS2_32_BIT_ERROR_CODES;
  93         if (cli->use_spnego)
  94                 flags2 |= FLAGS2_EXTENDED_SECURITY;
  95         SSVAL(buf,smb_flg2, flags2);
  96 }
  97
  98 /****************************************************************************
  99  Initialize Domain, user or password.
 100 ****************************************************************************/
 101
 102 NTSTATUS cli_set_domain(struct cli_state *cli, const char *domain)
 103 {
 104         TALLOC_FREE(cli->domain);
 105         cli->domain = talloc_strdup(cli, domain ? domain : "");
 106         if (cli->domain == NULL) {
 107                 return NT_STATUS_NO_MEMORY;
 108         }
 109         return NT_STATUS_OK;
 110 }
 111
 112 NTSTATUS cli_set_username(struct cli_state *cli, const char *username)
 113 {
 114         TALLOC_FREE(cli->user_name);
 115         cli->user_name = talloc_strdup(cli, username ? username : "");
 116         if (cli->user_name == NULL) {
 117                 return NT_STATUS_NO_MEMORY;
 118         }
 119         return NT_STATUS_OK;
 120 }
 121
 122 NTSTATUS cli_set_password(struct cli_state *cli, const char *password)
 123 {
 124         TALLOC_FREE(cli->password);
 125
 126         /* Password can be NULL. */
 127         if (password) {
 128                 cli->password = talloc_strdup(cli, password);
 129                 if (cli->password == NULL) {
 130                         return NT_STATUS_NO_MEMORY;
 131                 }
 132         } else {
 133                 /* Use zero NTLMSSP hashes and session key. */
 134                 cli->password = NULL;
 135         }
 136
 137         return NT_STATUS_OK;
 138 }
 139
 140 /****************************************************************************
 141  Initialise credentials of a client structure.
 142 ****************************************************************************/
 143
 144 NTSTATUS cli_init_creds(struct cli_state *cli, const char *username, const char *domain, const char *password)
 145 {
 146         NTSTATUS status = cli_set_username(cli, username);
 147         if (!NT_STATUS_IS_OK(status)) {
 148                 return status;
 149         }
 150         status = cli_set_domain(cli, domain);
 151         if (!NT_STATUS_IS_OK(status)) {
 152                 return status;
 153         }
 154         DEBUG(10,("cli_init_creds: user %s domain %s\n", cli->user_name, cli->domain));
 155
 156         return cli_set_password(cli, password);
 157 }
 158
 159 /****************************************************************************
 160  Initialise a client structure. Always returns a talloc'ed struct.
 161  Set the signing state (used from the command line).
 162 ****************************************************************************/
 163
 164 struct cli_state *cli_state_create(TALLOC_CTX *mem_ctx,
 165                                    int fd,
 166                                    const char *remote_name,
 167                                    const char *remote_realm,
 168                                    int signing_state, int flags)
 169 {
 170         struct cli_state *cli = NULL;
 171         bool allow_smb_signing = false;
 172         bool mandatory_signing = false;
 173         socklen_t ss_length;
 174         int ret;
 175
 176         /* Check the effective uid - make sure we are not setuid */
 177         if (is_setuid_root()) {
 178                 DEBUG(0,("libsmb based programs must *NOT* be setuid root.\n"));
 179                 return NULL;
 180         }
 181
 182         cli = talloc_zero(mem_ctx, struct cli_state);
 183         if (!cli) {
 184                 return NULL;
 185         }
 186
 187         cli->dfs_mountpoint = talloc_strdup(cli, "");
 188         if (!cli->dfs_mountpoint) {
 189                 goto error;
 190         }
 191         cli->raw_status = NT_STATUS_INTERNAL_ERROR;
 192         cli->protocol = PROTOCOL_NT1;
 193         cli->timeout = 20000; /* Timeout is in milliseconds. */
 194         cli->max_xmit = CLI_BUFFER_SIZE+4;
 195         cli->case_sensitive = false;
 196
 197         cli->use_spnego = lp_client_use_spnego();
 198
 199         cli->capabilities = CAP_UNICODE | CAP_STATUS32 | CAP_DFS;
 200
 201         /* Set the CLI_FORCE_DOSERR environment variable to test
 202            client routines using DOS errors instead of STATUS32
 203            ones.  This intended only as a temporary hack. */
 204         if (getenv("CLI_FORCE_DOSERR")) {
 205                 cli->force_dos_errors = true;
 206         }
 207         if (flags & CLI_FULL_CONNECTION_FORCE_DOS_ERRORS) {
 208                 cli->force_dos_errors = true;
 209         }
 210
 211         if (getenv("CLI_FORCE_ASCII")) {
 212                 cli->force_ascii = true;
 213         }
 214         if (flags & CLI_FULL_CONNECTION_FORCE_ASCII) {
 215                 cli->force_ascii = true;
 216         }
 217
 218         if (flags & CLI_FULL_CONNECTION_DONT_SPNEGO) {
 219                 cli->use_spnego = false;
 220         } else if (flags & CLI_FULL_CONNECTION_USE_KERBEROS) {
 221                 cli->use_kerberos = true;
 222         }
 223         if ((flags & CLI_FULL_CONNECTION_FALLBACK_AFTER_KERBEROS) &&
 224              cli->use_kerberos) {
 225                 cli->fallback_after_kerberos = true;
 226         }
 227
 228         if (flags & CLI_FULL_CONNECTION_USE_CCACHE) {
 229                 cli->use_ccache = true;
 230         }
 231
 232         if (flags & CLI_FULL_CONNECTION_OPLOCKS) {
 233                 cli->use_oplocks = true;
 234         }
 235         if (flags & CLI_FULL_CONNECTION_LEVEL_II_OPLOCKS) {
 236                 cli->use_level_II_oplocks = true;
 237         }
 238
 239         if (lp_client_signing()) {
 240                 allow_smb_signing = true;
 241         }
 242
 243         if (lp_client_signing() == Required) {
 244                 mandatory_signing = true;
 245         }
 246
 247         if (signing_state != Undefined) {
 248                 allow_smb_signing = true;
 249         }
 250
 251         if (signing_state == false) {
 252                 allow_smb_signing = false;
 253                 mandatory_signing = false;
 254         }
 255
 256         if (signing_state == Required) {
 257                 mandatory_signing = true;
 258         }
 259
 260         /* initialise signing */
 261         cli->signing_state = smb_signing_init(cli,
 262                                               allow_smb_signing,
 263                                               mandatory_signing);
 264         if (!cli->signing_state) {
 265                 goto error;
 266         }
 267
 268         cli->conn.outgoing = tevent_queue_create(cli, "cli_outgoing");
 269         if (cli->conn.outgoing == NULL) {
 270                 goto error;
 271         }
 272         cli->conn.pending = NULL;
 273
 274         cli->conn.remote_name = talloc_strdup(cli, remote_name);
 275         if (cli->conn.remote_name == NULL) {
 276                 goto error;
 277         }
 278
 279         if (remote_realm) {
 280                 cli->conn.remote_realm = talloc_strdup(cli, remote_realm);
 281                 if (cli->conn.remote_realm == NULL) {
 282                         goto error;
 283                 }
 284         }
 285
 286         cli->conn.fd = fd;
 287
 288         ss_length = sizeof(cli->conn.local_ss);
 289         ret = getsockname(fd,
 290                           (struct sockaddr *)(void *)&cli->conn.local_ss,
 291                           &ss_length);
 292         if (ret == -1) {
 293                 goto error;
 294         }
 295         ss_length = sizeof(cli->conn.remote_ss);
 296         ret = getpeername(fd,
 297                           (struct sockaddr *)(void *)&cli->conn.remote_ss,
 298                           &ss_length);
 299         if (ret == -1) {
 300                 goto error;
 301         }
 302
 303         cli->smb1.mid = 1;
 304         cli->smb1.pid = (uint16_t)sys_getpid();
 305         cli->smb1.vc_num = cli->smb1.pid;
 306         cli->smb1.tid = UINT16_MAX;
 307         cli->smb1.uid = UID_FIELD_INVALID;
 308
 309         cli->initialised = 1;
 310         return cli;
 311
 312         /* Clean up after malloc() error */
 313
 314  error:
 315
 316         TALLOC_FREE(cli);
 317         return NULL;
 318 }
 319
 320 bool cli_state_encryption_on(struct cli_state *cli)
 321 {
 322         return common_encryption_on(cli->trans_enc_state);
 323 }
 324
 325
 326 /****************************************************************************
 327  Close all pipes open on this session.
 328 ****************************************************************************/
 329
 330 void cli_nt_pipes_close(struct cli_state *cli)
 331 {
 332         while (cli->pipe_list != NULL) {
 333                 /*
 334                  * No TALLOC_FREE here!
 335                  */
 336                 talloc_free(cli->pipe_list);
 337         }
 338 }
 339
 340 /****************************************************************************
 341  Shutdown a client structure.
 342 ****************************************************************************/
 343
 344 static void _cli_shutdown(struct cli_state *cli)
 345 {
 346         cli_nt_pipes_close(cli);
 347
 348         /*
 349          * tell our peer to free his resources.  Wihtout this, when an
 350          * application attempts to do a graceful shutdown and calls
 351          * smbc_free_context() to clean up all connections, some connections
 352          * can remain active on the peer end, until some (long) timeout period
 353          * later.  This tree disconnect forces the peer to clean up, since the
 354          * connection will be going away.
 355          */
 356         if (cli_state_has_tcon(cli)) {
 357                 cli_tdis(cli);
 358         }
 359
 360         data_blob_free(&cli->secblob);
 361         data_blob_free(&cli->user_session_key);
 362
 363         cli_state_disconnect(cli);
 364
 365         /*
 366          * Need to free pending first, they remove themselves
 367          */
 368         while (cli->conn.pending) {
 369                 talloc_free(cli->conn.pending[0]);
 370         }
 371         TALLOC_FREE(cli);
 372 }
 373
 374 void cli_shutdown(struct cli_state *cli)
 375 {
 376         struct cli_state *cli_head;
 377         if (cli == NULL) {
 378                 return;
 379         }
 380         DLIST_HEAD(cli, cli_head);
 381         if (cli_head == cli) {
 382                 /*
 383                  * head of a DFS list, shutdown all subsidiary DFS
 384                  * connections.
 385                  */
 386                 struct cli_state *p, *next;
 387
 388                 for (p = cli_head->next; p; p = next) {
 389                         next = p->next;
 390                         DLIST_REMOVE(cli_head, p);
 391                         _cli_shutdown(p);
 392                 }
 393         } else {
 394                 DLIST_REMOVE(cli_head, cli);
 395         }
 396
 397         _cli_shutdown(cli);
 398 }
 399
 400 /****************************************************************************
 401  Set socket options on a open connection.
 402 ****************************************************************************/
 403
 404 void cli_sockopt(struct cli_state *cli, const char *options)
 405 {
 406         set_socket_options(cli->conn.fd, options);
 407 }
 408
 409 const struct sockaddr_storage *cli_state_local_sockaddr(struct cli_state *cli)
 410 {
 411         return &cli->conn.local_ss;
 412 }
 413
 414 const struct sockaddr_storage *cli_state_remote_sockaddr(struct cli_state *cli)
 415 {
 416         return &cli->conn.remote_ss;
 417 }
 418
 419 const char *cli_state_remote_name(struct cli_state *cli)
 420 {
 421         return cli->conn.remote_name;
 422 }
 423
 424 const char *cli_state_remote_realm(struct cli_state *cli)
 425 {
 426         return cli->conn.remote_realm;
 427 }
 428
 429 uint16_t cli_state_get_vc_num(struct cli_state *cli)
 430 {
 431         return cli->smb1.vc_num;
 432 }
 433
 434 /****************************************************************************
 435  Set the PID to use for smb messages. Return the old pid.
 436 ****************************************************************************/
 437
 438 uint16 cli_setpid(struct cli_state *cli, uint16 pid)
 439 {
 440         uint16_t ret = cli->smb1.pid;
 441         cli->smb1.pid = pid;
 442         return ret;
 443 }
 444
 445 uint16_t cli_getpid(struct cli_state *cli)
 446 {
 447         return cli->smb1.pid;
 448 }
 449
 450 bool cli_state_has_tcon(struct cli_state *cli)
 451 {
 452         if (cli->smb1.tid == UINT16_MAX) {
 453                 return false;
 454         }
 455
 456         return true;
 457 }
 458
 459 uint16_t cli_state_get_tid(struct cli_state *cli)
 460 {
 461         return cli->smb1.tid;
 462 }
 463
 464 uint16_t cli_state_set_tid(struct cli_state *cli, uint16_t tid)
 465 {
 466         uint16_t ret = cli->smb1.tid;
 467         cli->smb1.tid = tid;
 468         return ret;
 469 }
 470
 471 uint16_t cli_state_get_uid(struct cli_state *cli)
 472 {
 473         return cli->smb1.uid;
 474 }
 475
 476 uint16_t cli_state_set_uid(struct cli_state *cli, uint16_t uid)
 477 {
 478         uint16_t ret = cli->smb1.uid;
 479         cli->smb1.uid = uid;
 480         return ret;
 481 }
 482
 483 /****************************************************************************
 484  Set the case sensitivity flag on the packets. Returns old state.
 485 ****************************************************************************/
 486
 487 bool cli_set_case_sensitive(struct cli_state *cli, bool case_sensitive)
 488 {
 489         bool ret = cli->case_sensitive;
 490         cli->case_sensitive = case_sensitive;
 491         return ret;
 492 }
 493
 494 enum protocol_types cli_state_protocol(struct cli_state *cli)
 495 {
 496         return cli->protocol;
 497 }
 498
 499 uint32_t cli_state_capabilities(struct cli_state *cli)
 500 {
 501         return cli->capabilities;
 502 }
 503
 504 struct cli_echo_state {
 505         uint16_t vwv[1];
 506         DATA_BLOB data;
 507         int num_echos;
 508 };
 509
 510 static void cli_echo_done(struct tevent_req *subreq);
 511
 512 struct tevent_req *cli_echo_send(TALLOC_CTX *mem_ctx, struct event_context *ev,
 513                                  struct cli_state *cli, uint16_t num_echos,
 514                                  DATA_BLOB data)
 515 {
 516         struct tevent_req *req, *subreq;
 517         struct cli_echo_state *state;
 518
 519         req = tevent_req_create(mem_ctx, &state, struct cli_echo_state);
 520         if (req == NULL) {
 521                 return NULL;
 522         }
 523         SSVAL(state->vwv, 0, num_echos);
 524         state->data = data;
 525         state->num_echos = num_echos;
 526
 527         subreq = cli_smb_send(state, ev, cli, SMBecho, 0, 1, state->vwv,
 528                               data.length, data.data);
 529         if (subreq == NULL) {
 530                 goto fail;
 531         }
 532         tevent_req_set_callback(subreq, cli_echo_done, req);
 533         return req;
 534  fail:
 535         TALLOC_FREE(req);
 536         return NULL;
 537 }
 538
 539 static void cli_echo_done(struct tevent_req *subreq)
 540 {
 541         struct tevent_req *req = tevent_req_callback_data(
 542                 subreq, struct tevent_req);
 543         struct cli_echo_state *state = tevent_req_data(
 544                 req, struct cli_echo_state);
 545         NTSTATUS status;
 546         uint32_t num_bytes;
 547         uint8_t *bytes;
 548         uint8_t *inbuf;
 549
 550         status = cli_smb_recv(subreq, state, &inbuf, 0, NULL, NULL,
 551                               &num_bytes, &bytes);
 552         if (!NT_STATUS_IS_OK(status)) {
 553                 tevent_req_nterror(req, status);
 554                 return;
 555         }
 556         if ((num_bytes != state->data.length)
 557             || (memcmp(bytes, state->data.data, num_bytes) != 0)) {
 558                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 559                 return;
 560         }
 561
 562         state->num_echos -=1;
 563         if (state->num_echos == 0) {
 564                 tevent_req_done(req);
 565                 return;
 566         }
 567
 568         if (!cli_smb_req_set_pending(subreq)) {
 569                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 570                 return;
 571         }
 572 }
 573
 574 /**
 575  * Get the result out from an echo request
 576  * @param[in] req       The async_req from cli_echo_send
 577  * @retval Did the server reply correctly?
 578  */
 579
 580 NTSTATUS cli_echo_recv(struct tevent_req *req)
 581 {
 582         return tevent_req_simple_recv_ntstatus(req);
 583 }
 584
 585 /**
 586  * @brief Send/Receive SMBEcho requests
 587  * @param[in] mem_ctx   The memory context to put the async_req on
 588  * @param[in] ev        The event context that will call us back
 589  * @param[in] cli       The connection to send the echo to
 590  * @param[in] num_echos How many times do we want to get the reply?
 591  * @param[in] data      The data we want to get back
 592  * @retval Did the server reply correctly?
 593  */
 594
 595 NTSTATUS cli_echo(struct cli_state *cli, uint16_t num_echos, DATA_BLOB data)
 596 {
 597         TALLOC_CTX *frame = talloc_stackframe();
 598         struct event_context *ev;
 599         struct tevent_req *req;
 600         NTSTATUS status = NT_STATUS_OK;
 601
 602         if (cli_has_async_calls(cli)) {
 603                 /*
 604                  * Can't use sync call while an async call is in flight
 605                  */
 606                 status = NT_STATUS_INVALID_PARAMETER;
 607                 goto fail;
 608         }
 609
 610         ev = event_context_init(frame);
 611         if (ev == NULL) {
 612                 status = NT_STATUS_NO_MEMORY;
 613                 goto fail;
 614         }
 615
 616         req = cli_echo_send(frame, ev, cli, num_echos, data);
 617         if (req == NULL) {
 618                 status = NT_STATUS_NO_MEMORY;
 619                 goto fail;
 620         }
 621
 622         if (!tevent_req_poll(req, ev)) {
 623                 status = map_nt_error_from_unix(errno);
 624                 goto fail;
 625         }
 626
 627         status = cli_echo_recv(req);
 628  fail:
 629         TALLOC_FREE(frame);
 630         return status;
 631 }
 632
 633 /**
 634  * Is the SMB command able to hold an AND_X successor
 635  * @param[in] cmd       The SMB command in question
 636  * @retval Can we add a chained request after "cmd"?
 637  */
 638 bool is_andx_req(uint8_t cmd)
 639 {
 640         switch (cmd) {
 641         case SMBtconX:
 642         case SMBlockingX:
 643         case SMBopenX:
 644         case SMBreadX:
 645         case SMBwriteX:
 646         case SMBsesssetupX:
 647         case SMBulogoffX:
 648         case SMBntcreateX:
 649                 return true;
 650                 break;
 651         default:
 652                 break;
 653         }
 654
 655         return false;
 656 }
 657
 658 NTSTATUS cli_smb(TALLOC_CTX *mem_ctx, struct cli_state *cli,
 659                  uint8_t smb_command, uint8_t additional_flags,
 660                  uint8_t wct, uint16_t *vwv,
 661                  uint32_t num_bytes, const uint8_t *bytes,
 662                  struct tevent_req **result_parent,
 663                  uint8_t min_wct, uint8_t *pwct, uint16_t **pvwv,
 664                  uint32_t *pnum_bytes, uint8_t **pbytes)
 665 {
 666         struct tevent_context *ev;
 667         struct tevent_req *req = NULL;
 668         NTSTATUS status = NT_STATUS_NO_MEMORY;
 669
 670         if (cli_has_async_calls(cli)) {
 671                 return NT_STATUS_INVALID_PARAMETER;
 672         }
 673         ev = tevent_context_init(mem_ctx);
 674         if (ev == NULL) {
 675                 goto fail;
 676         }
 677         req = cli_smb_send(mem_ctx, ev, cli, smb_command, additional_flags,
 678                            wct, vwv, num_bytes, bytes);
 679         if (req == NULL) {
 680                 goto fail;
 681         }
 682         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
 683                 goto fail;
 684         }
 685         status = cli_smb_recv(req, NULL, NULL, min_wct, pwct, pvwv,
 686                               pnum_bytes, pbytes);
 687 fail:
 688         TALLOC_FREE(ev);
 689         if (NT_STATUS_IS_OK(status) && (result_parent != NULL)) {
 690                 *result_parent = req;
 691         }
 692         return status;
 693 }